Vortex flowmeter | Introduction to vortex flowmeter

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1. The difference between turbine flowmeter and vortex flowmeter

Turbine flowmeter and vortex flowmeter have significant differences in design principles, application scope, and characteristics, as follows: Design principle Turbine flowmeter: belongs to velocity flowmeter, focusing on measuring liquids. The principle is to use the relationship between the rotational angular velocity of the impeller placed in the liquid and the liquid flow velocity, and calculate the liquid flow rate by measuring the impeller speed. Vortex flowmeter: designed and manufactured based on the Karman vortex principle, using fluid oscillation principle to measure flow rate. When a fluid passes through a vortex sealed flow transmitter in a pipeline, two columns of vortices proportional to the flow velocity will alternate up and down behind the triangular vortex generator. The frequency of vortex release is related to the average velocity of the fluid and the characteristics of the vortex generator. Application scope: Turbine flowmeter is widely used for measuring objects such as petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas, and low-temperature flow sensors. Vortex flowmeter: mainly used for flow measurement of industrial pipeline medium fluids, suitable for various media such as gas, liquid, vapor, etc. Characteristics of turbine flowmeter: simple structure, few processed parts, light weight, easy maintenance. Large circulation capacity, with a large amount of flow that can be passed through with the same caliber. Can adapt to high parameter environments such as high temperature, high pressure, and low temperature. Vortex flowmeter: small pressure loss, large range, high accuracy. When measuring

2. Calculation formula for frequency and flow rate of vortex flowmeter? In general, the flow equation of a turbine flowmeter can be divided into two types: practical flow equation and theoretical flow equation. Practical flow equation: qv=f/K formula 1; In the equation qm=qv ρ, qv and qm respectively represent volumetric flow rates, m3/s， Quality flow, kg/s; F is the frequency of the output signal of the flowmeter, Hz; K is the instrument coefficient of the flowmeter, P/m3。 According to the Instrumentation World Network, the coefficient of a turbine flowmeter can be divided into two segments, namely the linear segment and the nonlinear segment. The linear segment is about two-thirds of its working segment, and its characteristics are related to the sensor structure size and fluid viscosity. In the nonlinear segment, the characteristics are greatly affected by bearing friction and fluid viscous resistance. When the flow rate is below the lower limit of the sensor flow rate, the instrument coefficient changes rapidly with the flow rate. The pressure loss is approximately proportional to the square of the flow rate. When the traffic exceeds the upper limit, attention should be paid to preventing cavitation. The shape of TUF characteristic curves with similar structures is similar, with only differences in the level of systematic error. The characteristic curve of the turbine flowmeter is calibrated by a flow verification device, which completely disregards

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